Balance Sheet Components - Property And Equipment And Accumulated Depreciation (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 805,395	$ 786,800
Less: Accumulated depreciation	(371,023)	(368,519)
Property and equipment, net	434,372	418,281
Accrued participation liabilities, due in next operating cycle	0
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	294,358	282,028
Information technology
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 229,168	$ 224,296
Estimated Useful Lives	3 years	3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 70,125	$ 63,667
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 years	3 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	15 years	15 years
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 32,787	$ 73,468
Estimated Useful Lives	30 years	30 years
Corporate aircraft
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 99,009	$ 62,560
Estimated Useful Lives	8 years	8 years
DVD operations equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 53,416	$ 53,416
Estimated Useful Lives	5 years	5 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,117	$ 1,692
Estimated Useful Lives	3 years	3 years
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 6,125	$ 6,125
Capital work-in-progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 18,290	$ 19,548